EP0341169A2 - Verfahren zur elektrochemischen Identifizierung von Al-Legierungen - Google Patents

Verfahren zur elektrochemischen Identifizierung von Al-Legierungen Download PDF

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Publication number
EP0341169A2
EP0341169A2 EP89420165A EP89420165A EP0341169A2 EP 0341169 A2 EP0341169 A2 EP 0341169A2 EP 89420165 A EP89420165 A EP 89420165A EP 89420165 A EP89420165 A EP 89420165A EP 0341169 A2 EP0341169 A2 EP 0341169A2
Authority
EP
European Patent Office
Prior art keywords
identification
current density
alloys
situ
curves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89420165A
Other languages
English (en)
French (fr)
Other versions
EP0341169A3 (de
Inventor
Christophe Bommier
Philippe Gimenez
Jean-Claude Kucza
Jacques Rabiet
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pechiney SA
Original Assignee
Pechiney SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pechiney SA filed Critical Pechiney SA
Publication of EP0341169A2 publication Critical patent/EP0341169A2/de
Publication of EP0341169A3 publication Critical patent/EP0341169A3/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
    • G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
    • G01N27/416—Systems
    • G01N27/4161—Systems measuring the voltage and using a constant current supply, e.g. chronopotentiometry

Definitions

  • the invention relates to a method for identifying the external face (s) of Al alloy of a homogeneous or composite material by electrochemical means.
  • the problem which is at the basis of the invention is the practical difficulty, both at the manufacturer and at the customer, to identify throughout the manufacturing range, and quickly and non-destructively the nature of a homogeneous material based on Al or an Al-based plated composite, such as may be encountered for example in the manufacture of brazed heat exchangers.
  • the method according to the invention consists in forming, in situ, on the product to be identified, an anodic layer by electrolysis under determined conditions and in monitoring the evolution of the voltage U at the terminals of the electrolyser as a function of time t at during an intentiostatic test.
  • the shape and the relative position of the curves U f (t), thus obtained, makes it possible to identify the different alloys tested.
  • anodizing is carried out as follows: - intensity: constant between 0.1 mA / cm2 and 100 mA / cm2 of anode surface - constant temperature to within ⁇ 2 ° C between 0 and 100 ° C - electrolyte: can be chosen from tartrate, citrate, borate, tetraborate, or ammonium, sodium or potassium adipate or a mixture of these salts whose concentration is between 1 g / l and saturation. the cathode being constituted by an alloy 3003 or 1199. - the duration of the test is generally less than 7 minutes.
  • the electrical assembly (fig. 1) comprises a direct current generator, for example 120 v - 20 mA mounted in series with an intensiostat 2 and the electrolysis cell 3, the anode of which is the sample to be analyzed 4 and the cathode 5 is in 3003.
  • a 6 U f (t) recorder is mounted on the terminals of the electrolyser.
  • the electrolyser used is shown in FIG. 5. It comprises an electrolysis tank 7 in pyrex supported by a base 8, a flange - support 9 and a seal 10. It is formed at its upper part by a plexiglass tank 1 which is crossed by cathode 5.
  • the sample 4 here a strip, is fixed to the lower part of the electrolyser 3 by a Teflon seal 12 and a clamping system 13,14,15,16 with screw 17.
  • the electrolyser is filled with electrolyte 18.
  • the electrolyser used may be of a different nature from that shown in FIG. 5; in particular, it can be of the "buffer" type where the electrolyte is supported by a porous medium (felt, sintered glass, etc.) with direct manual application to the sample to be analyzed.
  • a porous medium felt, sintered glass, etc.
  • the method according to the invention has the following advantages over the marking methods of the prior art: - non-destructive method, usable in situ on products that can be large (coils, plates, sheets, etc ...) - almost instant identification - high reliability - ease of use and economy of use.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Electrochemistry (AREA)
  • Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • General Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
EP19890420165 1988-05-03 1989-05-02 Verfahren zur elektrochemischen Identifizierung von Al-Legierungen Withdrawn EP0341169A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8806431A FR2631123B1 (fr) 1988-05-03 1988-05-03 Procede d'identification d'alliages d'al par une voie electrochimique
FR8806431 1988-05-03

Publications (2)

Publication Number Publication Date
EP0341169A2 true EP0341169A2 (de) 1989-11-08
EP0341169A3 EP0341169A3 (de) 1991-09-04

Family

ID=9366264

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890420165 Withdrawn EP0341169A3 (de) 1988-05-03 1989-05-02 Verfahren zur elektrochemischen Identifizierung von Al-Legierungen

Country Status (8)

Country Link
US (1) US4898646A (de)
EP (1) EP0341169A3 (de)
DK (1) DK213689A (de)
FI (1) FI892104A (de)
FR (1) FR2631123B1 (de)
IS (1) IS1482B (de)
NO (1) NO891814L (de)
PT (1) PT90441B (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2501003C1 (ru) * 2012-06-22 2013-12-10 Анатолий Иванович Мамаев Способ идентификации металлов и сплавов и устройство для его осуществления

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531747A (en) * 1947-06-12 1950-11-28 Robert F Stearn Metal identifier
US3428532A (en) * 1964-02-06 1969-02-18 Continental Oil Co Method for identifying metals and alloys
GB2092304A (en) * 1981-01-27 1982-08-11 Helmut Fischer Gmbh & Co A Device for Measuring the Thickness of a Metal Deposition Layer
EP0107491A2 (de) * 1982-10-22 1984-05-02 Amchem Products, Inc. Elektrochemisches Verfahren zur Prüfung von Oberflächeneigenschaften und Prüfvorrichtung zur Ausführung dieses Verfahrens
US4564436A (en) * 1984-06-01 1986-01-14 Cise-Centro Informazioni Studi Esperienze S.P.A. Apparatus for measuring the degree of sensitization of metal articles
US4629536A (en) * 1985-03-12 1986-12-16 Energy Conversion Devices, Inc. Multilayer depth profile method

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2531747A (en) * 1947-06-12 1950-11-28 Robert F Stearn Metal identifier
US3428532A (en) * 1964-02-06 1969-02-18 Continental Oil Co Method for identifying metals and alloys
GB2092304A (en) * 1981-01-27 1982-08-11 Helmut Fischer Gmbh & Co A Device for Measuring the Thickness of a Metal Deposition Layer
EP0107491A2 (de) * 1982-10-22 1984-05-02 Amchem Products, Inc. Elektrochemisches Verfahren zur Prüfung von Oberflächeneigenschaften und Prüfvorrichtung zur Ausführung dieses Verfahrens
US4564436A (en) * 1984-06-01 1986-01-14 Cise-Centro Informazioni Studi Esperienze S.P.A. Apparatus for measuring the degree of sensitization of metal articles
US4629536A (en) * 1985-03-12 1986-12-16 Energy Conversion Devices, Inc. Multilayer depth profile method

Also Published As

Publication number Publication date
EP0341169A3 (de) 1991-09-04
PT90441B (pt) 1994-09-30
DK213689A (da) 1989-11-04
IS1482B (is) 1992-06-30
PT90441A (pt) 1989-11-30
FI892104A0 (fi) 1989-05-02
IS3463A7 (is) 1989-11-04
FI892104A (fi) 1989-11-04
FR2631123A1 (fr) 1989-11-10
US4898646A (en) 1990-02-06
NO891814D0 (no) 1989-05-02
FR2631123B1 (fr) 1992-01-10
DK213689D0 (da) 1989-05-02
NO891814L (no) 1989-11-06

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